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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6967bcb5cae950ff65889339ca722191fa4a4214f99197ad13c360be915e81d3' 
  AND token = 'CaVuJwRl8vM1nmnkoY6ZYLtvH/b5sXeN3RXxBJFt2IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}